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H. N.'NIOHOLS.

ORE GONGENTRATOR;

No. 354,989. I Patented De0. 28, 1886..

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UNTTE STATES ATENT ErcE.

HERBERT N. NICHOLS, OF DENVER, COLORADO.

ORE-CONCE-NTRATOR.

EPECIFICATION forming-part of Letters Patent No. 354,989, dated December 28', 1886.

Application filed April 30, 1886.

To aZZ whom, it may concern:

Be it known that I, HERBERT N. N IOHOLS, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Ore-Concentrators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the concentration or precipitation of various ores or metals.

Figure l is a longitudinal vertical section of an ore-concentrating machine to which I have applied my improvements. Fig. 2 is a plan view of the same, partly broken away. Fig. 3 represents a perspective view of the table proper with some of its connectiohs.

The objects of the invention are to impart to the vibrating concentrating table a rebound ing blow or sudden arrest of motion for the more efficient precipitation or concentrates;

and, further, to improve the construction of the pan or table, together with further minor improvements.

My improvement consists in the following construction and combination, which will first be fully described, and the features then pointed out in the claims.

Referring to the different parts by different numerals and letters, 1 represents the frame of the machine, which is composed of two or more longitudinal timbers and transverse tiepieces.

2 is the vibrating ore-table. It is composed of longitudinal stringers 3 and cross-pieces 4, which support the sides and ends of the table.

:20 is the table bottom or bed. This bed is preferably made of sheet metal, in order to secure a vibrating diaphragmatic action when the table is reciprocated.

I" are a series of longitudinally-arranged bars rigidly supported in their mid-length by a cross bar, 5, secured to the table frame. These bars lie in close proximity to the under side of the bed w, and prevent any undue vibration of said bed. By securing the bars P at substantially their centers and allowing their opposite ends to vibrate I obtain an improved result in the concentration of ores over other similar deviceshitherto used for the same purpose. This result is attained by securing Serial No. 200,752. (No model.)

the bars I? rigidly at their centers, where the vibratory motion of the table-bottom is the greatest, neutralizing the excessive motion of the bottom at that point, while at the ends of the table, where the vibrationof the table-bottom is less marked, the bars P have a spring or give, so as not to counteract the vibration,

of the bottom to such an extent as to destroy it. In this way a substantially uniform vibration is imparted throughout the area of the table-bottom.

O is an inclined deflectingboard arranged near the head of the table and within it, and serves to deflect the influx of water toward the rear of the table. The lower edge of this inclined plate does not touch the bed 00, but lies within, say, one-fourth inch of the bottom. I prefer to make it adjustable in any suitable way-such as oblique grooves in the sides of the table-for the purpose of regulating the distance between the bottom of the plate 0 and bed 00.

E is an opening at the head of the table,

provided with avalve for the discharge of the concentrates.

A is the hinged pipe-connection for supply ing the table with water.

B is the pulp-distributer. v

G is the riffle-bar, extending across the tail of the table.

E is the discharge -spout, communicating with the trough in the rear of the riffle-bar for the discharge of the tailings.

Securely bolted to the table is a longitudinal frame-piece, O, the forward end of which constitutes a bumper for the table.

T is a socket secured to the frame-piece O, and within which the upper end of the rocklever S operates in working the table. This socket may be constructed in any suitable way. In the drawings I have shown a metal casting bolted to the table. The lever S is pivoted at the frame, and receives the impact of the frametimber or bumper O. I

In operation the table receives but one sudden jar in its forward-and-back movement, and this occurs upon the contact of bumper O with bumper R. During this contact, however, there is an auxiliary or rebounding blow, due to the give of spring K and the rebound of the table, which is again forced against j of plate 0.

bumper R by the recoil of said spring. The pitman, connectingrod, and lever under the table all have loose joints, with elastic cushions interposed at the joints, which permit of this action. This movement is a very efficient one in the successful concentration of ores. The plate 0 serves to stop and throw back the sand or other extraneous matter which will be found on top of the concentrates. This operation is also assisted by the flow of water through distributer A upon the plate 0. The pulp,which is fed in at B, separates largely before it reaches plate 0, and the mineral is all on the bottom. 7

Only clean concentrates pass under the edge In some instances, where the work may require it, I propose to use several of these plates.

The diaphragmatic movement of the tablebottom in connection with the rigid deflecting board 0 varies the size of the opening beneath the latter during the operation of the table, and very materially aids the successful concentration of ores. The vibration of the'tablebottom under the deflecting-plate G acts also, by reason of the successive increase and decrease of the opening between the two, to prevent the said openingfrom becoming clogged, and the action of the concentrator thereby impaired.

What I claim is- 1. A concentrating-table provided with a Vibrating bottom and a frame supported in its center and free at its ends, arranged under said bottom and in close proximity thereto, and a support for the frame attached tothe table.

2. A concentratingtable having a dischargeopening for concentrates, a bottom having a diaphragmatic motion, an inclinedplate ar-' ranged within and across the table, but not in contact with the bottom, and a hinged distributer-pipe located above the inclined plate.

3. The combination, with an oscillating arm and a concentrating-table, of a yielding pitman provided with a loose socket at each end thereof, elastic cushions on both sides of the sockets, and a yielding spring interposed in the pitman, substantially as stated.

4. The combination of an oscillating arm,'a yielding pitman having a loose socket, can oscillating lever working withinsaid socket, and a concentrating-table having a socket on its under side in-which said lever works.

In testimony whereof I aflix my signature in presence of two witnesses.

HERBERT N. NICHOLS, 

